Reducing the startup time of aerobic granular sludge reactors through seeding floccular sludge with crushed aerobic granules

Pijuan, Maite, Werner, Ursula and Yuan, Zhiguo (2011) Reducing the startup time of aerobic granular sludge reactors through seeding floccular sludge with crushed aerobic granules. Water Research, 45 16: 5075-5083. doi:10.1016/j.watres.2011.07.009


Author Pijuan, Maite
Werner, Ursula
Yuan, Zhiguo
Title Reducing the startup time of aerobic granular sludge reactors through seeding floccular sludge with crushed aerobic granules
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2011-10
Sub-type Article (original research)
DOI 10.1016/j.watres.2011.07.009
Volume 45
Issue 16
Start page 5075
End page 5083
Total pages 9
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2012
Language eng
Abstract One of the main challenging issues for the aerobic granular sludge technology is the long startup time when dealing with real wastewaters. This study presents a novel strategy to reduce the time required for granulation while ensuring a high level of nutrient removal. This new approach consists of seeding the reactor with a mixture of crushed aerobic granules and floccular sludge. The effectiveness of the strategy was demonstrated using abattoir wastewater, containing nitrogen and phosphorus at approximately 250 mgN/L and 30 mgP/L, respectively. Seven different mixtures of crushed granules and floccular sludge at granular sludge fractions (w/w in dry mass) of 0%, 5%, 10%, 15%, 25%, 30% and 50% were used to start eight granulation processes. The granulation time (defined as the time when the 10th percentile bacterial aggregate size is larger than 200 μm) displayed a strong dependency on the fraction of granular sludge. The shortest granulation time of 18 days was obtained with 50% crushed granules, in comparison with 133 days with 5% crushed granules. Full granulation was not achieved in the two trials without seeding with crushed granules. In contrast to the 100% floccular sludge cases, where a substantial loss of biomass occurred during granulation, the biomass concentration in all other trails did not decrease during granulation. This allowed that good nitrogen removal was maintained in all the reactors during the granulation process. However, enhanced biological phosphorus removal was achieved in only one of the eight trials. This was likely due to the temporary accumulation of nitrite, a strong inhibitor of polyphosphate accumulating organisms.
Keyword Aerobic granules
Startup
Seeding
Crushed granules
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Advanced Water Management Centre Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 36 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 38 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 23 Oct 2011, 00:01:25 EST by System User on behalf of Advanced Water Management Centre